/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: fzykd
 * Date: 2023-05-14
 * Time: 17:01
 */

//接口 要WeatherDate来 实现
public interface Subject {

    public void registerObserver(Observer o);
    public void removeObserver(Observer o);
    public void notifyObservers();

}
